Re: [PATCH 2/4] input: add Qualcomm QPNP haptics driver

[Caleb Connolly <caleb@xxxxxxxxxxxxx>]

Hi Bjorn,

Thanks a lot for your feedback.

On 13/06/2021 5:09 am, Bjorn Andersson wrote:
> On Sat 12 Jun 15:54 CDT 2021, Caleb Connolly wrote:
>
>> Add support for the haptics found in pmi8998 and related PMICs.
>> Based on the ff-memless interface. Currently this driver provides
>> a partial implementation of hardware features.
>>
>> This driver only supports LRAs (Linear Resonant Actuators) in the "buffer"
>> mode with a single wave pattern.
>>
>> Signed-off-by: Caleb Connolly <caleb@xxxxxxxxxxxxx>
>
> Please use a cover letter when posting multiple patches.
I'm not sure why the cover letter didn't make it to your inbox, here's a
link:
https://lore.kernel.org/linux-arm-msm/20210612205405.1233588-1-caleb@xxxxxxxxxxxxx/
>
>> ---
>>  drivers/input/misc/Kconfig        |   11 +
>>  drivers/input/misc/Makefile       |    1 +
>>  drivers/input/misc/qpnp-haptics.c | 1022 +++++++++++++++++++++++++++++
>>  3 files changed, 1034 insertions(+)
>>  create mode 100644 drivers/input/misc/qpnp-haptics.c
>>
>> diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
>> index 498cde376981..b5ba03e6cf58 100644
>> --- a/drivers/input/misc/Kconfig
>> +++ b/drivers/input/misc/Kconfig
>> @@ -186,6 +186,17 @@ config INPUT_PMIC8XXX_PWRKEY
>>  	  To compile this driver as a module, choose M here: the
>>  	  module will be called pmic8xxx-pwrkey.
>>
>> +config INPUT_QPNP_HAPTICS
>
> No-one knows what "QPNP" really is, so please name this
> "INPUT_QCOM_SPMI_HAPTICS"
>
>> +	tristate "Qualcomm QPNP HAPTICS"
>> +	depends on ARCH_QCOM
>
> "depends on SPMI" makes sense here.
>
>> +	select INPUT_FF_MEMLESS
>> +	help
>> +	  This option enables support for the haptics found in pmi8998 and
>> +	  related PMICs. Based on the ff-memless interface.
>> +
>> +	  To compile this driver as module, choose M here: the
>> +	  module will be called qpnp-haptics.
>> +
>>  config INPUT_SPARCSPKR
>>  	tristate "SPARC Speaker support"
>>  	depends on PCI && SPARC64
>> diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
>> index f593beed7e05..c43290163db0 100644
>> --- a/drivers/input/misc/Makefile
>> +++ b/drivers/input/misc/Makefile
>> @@ -65,6 +65,7 @@ obj-$(CONFIG_INPUT_PMIC8XXX_PWRKEY)	+= pmic8xxx-pwrkey.o
>>  obj-$(CONFIG_INPUT_POWERMATE)		+= powermate.o
>>  obj-$(CONFIG_INPUT_PWM_BEEPER)		+= pwm-beeper.o
>>  obj-$(CONFIG_INPUT_PWM_VIBRA)		+= pwm-vibra.o
>> +obj-$(CONFIG_INPUT_QPNP_HAPTICS)	+= qpnp-haptics.o
>>  obj-$(CONFIG_INPUT_RAVE_SP_PWRBUTTON)	+= rave-sp-pwrbutton.o
>>  obj-$(CONFIG_INPUT_RB532_BUTTON)	+= rb532_button.o
>>  obj-$(CONFIG_INPUT_REGULATOR_HAPTIC)	+= regulator-haptic.o
>> diff --git a/drivers/input/misc/qpnp-haptics.c b/drivers/input/misc/qpnp-haptics.c
>
> Again, qcom-spmi-haptics.c
>
>> new file mode 100644
>> index 000000000000..daa7a18ffc7d
>> --- /dev/null
>> +++ b/drivers/input/misc/qpnp-haptics.c
>> @@ -0,0 +1,1022 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * Copyright (c) 2021, Caleb Connolly <caleb@xxxxxxxxxxxxx>
>> + * Qualcomm Plug and Play haptics driver for pmi8998 and related PMICs.
>> + * Based on ./pm8xxx-vibrator.c
>
> Enough "based on" to warrant carrying some copyrights?
Hmm, I only stole the input device parts, so perhaps not.
>
>> + */
>> +
>> +#include <dt-bindings/input/qcom,qpnp-haptics.h>
>> +
>> +#include <linux/atomic.h>
>> +#include <linux/bits.h>
>> +#include <linux/errno.h>
>> +#include <linux/input.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/kernel.h>
>> +#include <linux/log2.h>
>> +#include <linux/minmax.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/of_device.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/regmap.h>
>> +#include <linux/slab.h>
>> +#include <linux/time.h>
>> +#include <linux/types.h>
>> +
>> +/*
>> + * Register and bit definitions
>> + */
>
> This comment doesn't add much value.
>
>> +
>> +#define HAP_STATUS_1_REG(chip)		(chip->base + 0x0A)
>
> This style is somewhat unusual, please define the offset here and do the
> math in qpnp_haptics_read() et al.
>
>> +#define HAP_BUSY_BIT			BIT(1)
>> +#define SC_FLAG_BIT			BIT(3)
>> +#define AUTO_RES_ERROR_BIT		BIT(4)
>> +
>> +#define HAP_LRA_AUTO_RES_LO_REG(chip)	(chip->base + 0x0B)
>> +#define HAP_LRA_AUTO_RES_HI_REG(chip)	(chip->base + 0x0C)
>> +
>> +#define HAP_EN_CTL_REG(chip)		(chip->base + 0x46)
>> +#define HAP_EN_BIT			BIT(7)
>> +
>> +#define HAP_EN_CTL2_REG(chip)		(chip->base + 0x48)
>> +#define BRAKE_EN_BIT			BIT(0)
>> +
>> +#define HAP_AUTO_RES_CTRL_REG(chip)	(chip->base + 0x4B)
>> +#define AUTO_RES_EN_BIT			BIT(7)
>> +#define AUTO_RES_ERR_RECOVERY_BIT	BIT(3)
>> +#define AUTO_RES_EN_FLAG_BIT	BIT(0)
>> +
>> +#define HAP_CFG1_REG(chip)		(chip->base + 0x4C)
>> +#define HAP_ACT_TYPE_MASK		BIT(0)
>> +
>> +#define HAP_CFG2_REG(chip)		(chip->base + 0x4D)
>> +#define HAP_LRA_RES_TYPE_MASK		BIT(0)
>> +
>> +#define HAP_SEL_REG(chip)		(chip->base + 0x4E)
>> +#define HAP_WF_SOURCE_MASK		GENMASK(5, 4)
>> +#define HAP_WF_SOURCE_SHIFT		4
>> +
>> +#define HAP_LRA_AUTO_RES_REG(chip)	(chip->base + 0x4F)
>> +#define LRA_AUTO_RES_MODE_MASK		GENMASK(6, 4)
>> +#define LRA_AUTO_RES_MODE_SHIFT		4
>> +#define LRA_HIGH_Z_MASK			GENMASK(3, 2)
>> +#define LRA_HIGH_Z_SHIFT		2
>> +#define LRA_RES_CAL_MASK		GENMASK(1, 0)
>> +#define HAP_RES_CAL_PERIOD_MIN		4
>> +#define HAP_RES_CAL_PERIOD_MAX		32
>> +
>> +#define HAP_VMAX_CFG_REG(chip)		(chip->base + 0x51)
>> +#define HAP_VMAX_OVD_BIT		BIT(6)
>> +#define HAP_VMAX_MASK			GENMASK(5, 1)
>> +#define HAP_VMAX_SHIFT			1
>> +
>> +#define HAP_ILIM_CFG_REG(chip)		(chip->base + 0x52)
>> +#define HAP_ILIM_SEL_MASK		BIT(0)
>> +#define HAP_ILIM_400_MA			0
>> +#define HAP_ILIM_800_MA			1
>> +
>> +#define HAP_SC_DEB_REG(chip)		(chip->base + 0x53)
>> +#define HAP_SC_DEB_MASK			GENMASK(2, 0)
>> +#define HAP_SC_DEB_CYCLES_MIN		0
>> +#define HAP_DEF_SC_DEB_CYCLES		8
>> +#define HAP_SC_DEB_CYCLES_MAX		32
>> +
>> +#define HAP_RATE_CFG1_REG(chip)		(chip->base + 0x54)
>> +#define HAP_RATE_CFG1_MASK		GENMASK(7, 0)
>> +#define HAP_RATE_CFG2_SHIFT		8 // As CFG2 is the most significant byte
>> +
>> +#define HAP_RATE_CFG2_REG(chip)		(chip->base + 0x55)
>> +#define HAP_RATE_CFG2_MASK		GENMASK(3, 0)
>> +
>> +#define HAP_SC_CLR_REG(chip)		(chip->base + 0x59)
>> +#define SC_CLR_BIT			BIT(0)
>> +
>> +#define HAP_BRAKE_REG(chip)		(chip->base + 0x5C)
>> +#define HAP_BRAKE_PAT_MASK		0x3
>> +
>> +#define HAP_WF_REPEAT_REG(chip)		(chip->base + 0x5E)
>> +#define WF_REPEAT_MASK			GENMASK(6, 4)
>> +#define WF_REPEAT_SHIFT			4
>> +#define WF_REPEAT_MIN			1
>> +#define WF_REPEAT_MAX			128
>> +#define WF_S_REPEAT_MASK		GENMASK(1, 0)
>> +#define WF_S_REPEAT_MIN			1
>> +#define WF_S_REPEAT_MAX			8
>> +
>> +#define HAP_WF_S1_REG(chip)		(chip->base + 0x60)
>> +#define HAP_WF_SIGN_BIT			BIT(7)
>> +#define HAP_WF_OVD_BIT			BIT(6)
>> +#define HAP_WF_SAMP_MAX			GENMASK(5, 1)
>> +#define HAP_WF_SAMPLE_LEN		8
>> +
>> +#define HAP_PLAY_REG(chip)		(chip->base + 0x70)
>> +#define HAP_PLAY_BIT			BIT(7)
>> +#define HAP_PAUSE_BIT			BIT(0)
>> +
>> +#define HAP_SEC_ACCESS_REG(chip)	(chip->base + 0xD0)
>> +#define HAP_SEC_ACCESS_UNLOCK		0xA5
>> +
>> +#define HAP_TEST2_REG(chip)		(chip->base + 0xE3)
>> +
>> +// Values
>> +#define HAP_VMAX_MIN_MV			116
>> +#define HAP_VMAX_MAX_MV			3596
>> +#define HAP_VMAX_MAX_MV_STRONG		3596
>> +
>> +#define HAP_WAVE_PLAY_RATE_MIN_US	0
>> +#define HAP_WAVE_PLAY_RATE_MAX_US	20475
>> +#define HAP_WAVE_PLAY_TIME_MAX_MS	15000
>> +
>> +#define AUTO_RES_ERR_POLL_TIME_NS	(20 * NSEC_PER_MSEC)
>> +#define HAPTICS_BACK_EMF_DELAY_US	20000
>> +
>> +#define HAP_BRAKE_PAT_LEN		4
>> +#define HAP_WAVE_SAMP_LEN		8
>> +#define NUM_WF_SET			4
>> +#define HAP_WAVE_SAMP_SET_LEN		(HAP_WAVE_SAMP_LEN * NUM_WF_SET)
>> +#define HAP_RATE_CFG_STEP_US		5
>> +
>> +#define SC_MAX_COUNT			5
>> +#define SC_COUNT_RST_DELAY_US		1000000
>> +
>> +enum hap_play_control {
>> +	HAP_STOP,
>> +	HAP_PAUSE,
>> +	HAP_PLAY,
>> +};
>> +
>> +/**
>> + * struct qpnp_haptics - struct for qpnp haptics data.
>> + *
>> + * @pdev: The platform device responsible for the haptics.
>> + * @regmap: Register map for the hardware block.
>> + * @input_dev: The input device used to receive events.
>> + * @work: Work struct to play effects.
>> + * @base: Base address of the regmap.
>> + * @active: Atomic value used to track if haptics are currently playing.
>> + * @play_irq: Fired to load the next wave pattern.
>> + * @sc_irq: Short circuit irq.
>> + * @last_sc_time: Time since the short circuit IRQ last fired.
>> + * @sc_count: Number of times the short circuit IRQ has fired in this interval.
>> + * @actuator_type: The type of actuator in use.
>> + * @wave_shape: The shape of the waves to use (sine or square).
>> + * @play_mode: The play mode to use (direct, buffer, pwm, audio).
>> + * @magnitude: The strength we should be playing at.
>> + * @vmax: Max voltage to use when playing.
>> + * @current_limit: The current limit for this hardware (400mA or 800mA).
>> + * @play_wave_rate: The wave rate to use for this hardware.
>> + * @wave_samp: The array of wave samples to write for buffer mode.
>> + * @brake_pat: The pattern to apply when braking.
>> + * @play_lock: Lock to be held when updating the hardware state.
>> + */
>> +struct qpnp_haptics {
>> +	struct platform_device *pdev;
>
> You only ever use this to get to &pdev->dev, so why not store that
> instead?
>
>> +	struct regmap *regmap;
>> +	struct input_dev *haptics_input_dev;
>> +	struct work_struct work;
>> +	u32 base;
>> +
>> +	atomic_t active;
>> +
>> +	int play_irq;
>> +	int sc_irq;
>> +	ktime_t last_sc_time;
>> +	u8 sc_count;
>> +
>> +	u8 actuator_type;
>> +	u8 wave_shape;
>> +	u8 play_mode;
>> +	int magnitude;
>> +	u32 vmax;
>> +	u32 current_limit;
>> +	u32 play_wave_rate;
>> +
>> +	u32 wave_samp[HAP_WAVE_SAMP_SET_LEN];
>> +	u8 brake_pat[HAP_BRAKE_PAT_LEN];
>> +
>> +	struct mutex play_lock;
>> +};
>> +
>> +static inline bool is_secure_addr(u16 addr)
>> +{
>> +	return (addr & 0xFF) > 0xD0;
>> +}
>> +
>> +static int qpnp_haptics_read(struct qpnp_haptics *haptics,
>> +	u16 addr, u8 *val, int len)
>> +{
>> +	int ret;
>> +
>> +	ret = regmap_bulk_read(haptics->regmap, addr, val, len);
>> +	if (ret < 0)
>> +		pr_err("Error reading address: 0x%x, ret %d\n", addr, ret);
>
> dev_err()
>
>> +
>> +	return ret;
>> +}
>> +
>> +static int qpnp_haptics_write(struct qpnp_haptics *haptics,
>> +	u16 addr, u8 *val, int len)
>> +{
>> +	int ret, i;
>> +
>> +	if (is_secure_addr(addr)) {
>> +		for (i = 0; i < len; i++) {
>> +			pr_info("%s: unlocking for addr: 0x%x, val: 0x%x", __func__,
>> +				addr, val[i]);
>
> This is more of a "debug print", so dev_dbg() would be better.
>
>> +			ret = regmap_write(haptics->regmap,
>> +				HAP_SEC_ACCESS_REG(haptics), HAP_SEC_ACCESS_UNLOCK);
>> +			if (ret < 0) {
>> +				pr_err("Error writing unlock code, ret %d\n",
>> +					ret);
>
> dev_err()
>
>> +				return ret;
>> +			}
>> +
>> +			ret = regmap_write(haptics->regmap, addr + i, val[i]);
>> +			if (ret < 0) {
>> +				pr_err("Error writing address 0x%x, ret %d\n",
>> +					addr + i, ret);
>> +				return ret;
>> +			}
>> +		}
>> +	} else {
>> +		if (len > 1)
>> +			ret = regmap_bulk_write(haptics->regmap, addr, val, len);
>> +		else
>> +			ret = regmap_write(haptics->regmap, addr, *val);
>> +	}
>> +
>> +	if (ret < 0)
>> +		pr_err("%s: Error writing address: 0x%x, ret %d\n", __func__, addr, ret);
>> +
>> +	return ret;
>> +}
>> +
>> +static int qpnp_haptics_write_masked(struct qpnp_haptics *haptics,
>> +	u16 addr, u8 mask, u8 val)
>> +{
>> +	int ret;
>> +
>> +	if (is_secure_addr(addr)) {
>> +		ret = regmap_write(haptics->regmap,
>> +			HAP_SEC_ACCESS_REG(haptics), HAP_SEC_ACCESS_UNLOCK);
>> +		if (ret < 0) {
>> +			pr_err("Error writing unlock code - ret %d\n", ret);
>> +			return ret;
>> +		}
>> +	}
>> +
>> +	ret = regmap_update_bits(haptics->regmap, addr, mask, val);
>> +	if (ret < 0)
>> +		pr_err("Error writing address: 0x%x - ret %d\n", addr, ret);
>> +
>> +	return ret;
>> +}
>> +
>> +static bool is_haptics_idle(struct qpnp_haptics *haptics)
>> +{
>> +	int ret;
>> +	u8 val;
>> +
>> +	if (haptics->play_mode == HAP_PLAY_DIRECT ||
>> +			haptics->play_mode == HAP_PLAY_PWM)
>> +		return true;
>> +
>> +	ret = qpnp_haptics_read(haptics, HAP_STATUS_1_REG(haptics), &val, 1);
>> +	if (ret < 0 || (val & HAP_BUSY_BIT))
>> +		return false;
>> +
>> +	return true;
>> +}
>> +
>> +static int qpnp_haptics_module_enable(struct qpnp_haptics *haptics, bool enable)
>> +{
>> +	u8 val;
>> +	int rc;
>> +
>> +	dev_dbg(&haptics->pdev->dev, "Setting module enable: %d", enable);
>> +
>> +	val = enable ? HAP_EN_BIT : 0;
>> +	rc = qpnp_haptics_write(haptics, HAP_EN_CTL_REG(haptics), &val, 1);
>
> rc will either be < 0 or 0, so you can just do:
> 	return qpnp_haptics_write();
>
>> +	if (rc < 0)
>> +		return rc;
>> +
>> +	return 0;
>> +}
>> +
>> +static int qpnp_haptics_write_vmax(struct qpnp_haptics *haptics)
>> +{
>> +	u8 val = 0;
>> +	int ret;
>> +	u32 vmax_mv = haptics->vmax;
>> +
>> +	vmax_mv = clamp_t(u32, vmax_mv, HAP_VMAX_MIN_MV, HAP_VMAX_MAX_MV);
>> +
>> +	dev_dbg(&haptics->pdev->dev, "Setting vmax to: %d", vmax_mv);
>> +
>> +	val = DIV_ROUND_CLOSEST(vmax_mv, HAP_VMAX_MIN_MV);
>> +	val <<= HAP_VMAX_SHIFT;
>> +	// overdrive is only supported on pm660
>
> Good to know...so what should I do with that information?
>
>> +	val &= ~HAP_VMAX_OVD_BIT;
>
> The only way I can see this bit being set is somehow vmax_mv turnes out
> to be more than 5 bits, but then you have a problem.
>
> Consider using FIELD_PREP to stuff the result in the bits and skip this.
>
>> +
>> +	ret = qpnp_haptics_write_masked(haptics, HAP_VMAX_CFG_REG(haptics),
>> +			HAP_VMAX_MASK | HAP_VMAX_OVD_BIT, val);
>> +	return ret;
>> +}
>> +
>> +static int qpnp_haptics_write_current_limit(struct qpnp_haptics *haptics)
>> +{
>> +	int ret;
>> +
>> +	haptics->current_limit = clamp_t(u32, haptics->current_limit,
>> +					 HAP_ILIM_400_MA, HAP_ILIM_800_MA);
>> +
>> +	dev_dbg(&haptics->pdev->dev, "Setting current_limit to: 0x%x", haptics->current_limit);
>> +
>> +	ret = qpnp_haptics_write_masked(haptics, HAP_ILIM_CFG_REG(haptics),
>> +			HAP_ILIM_SEL_MASK, haptics->current_limit);
>> +	return ret;
>> +}
>> +
>> +static int qpnp_haptics_write_play_mode(struct qpnp_haptics *haptics)
>> +{
>> +	u8 val = 0;
>> +	int ret;
>> +
>> +	if (!is_haptics_idle(haptics))
>> +		return -EBUSY;
>> +
>> +	dev_dbg(&haptics->pdev->dev, "Setting play_mode to: 0x%x", haptics->play_mode);
>> +
>> +	val = haptics->play_mode << HAP_WF_SOURCE_SHIFT;
>
> How about:
> 	val = FIELD_PREP(HAP_WF_SOURCE_MASK, haptics->play_mode);
>
>> +	ret = qpnp_haptics_write_masked(haptics, HAP_SEL_REG(haptics),
>> +			HAP_WF_SOURCE_MASK, val);
>
> return qpnp_haptics_write_masked()
>
>> +
>> +	return ret;
>> +}
>> +
>> +static int qpnp_haptics_write_play_rate(struct qpnp_haptics *haptics, u16 play_rate)
>> +{
>> +	int rc;
>> +	u8 val[2];
>> +
>> +	dev_dbg(&haptics->pdev->dev, "Setting play_rate to: %d", play_rate);
>> +
>> +	val[0] = play_rate & HAP_RATE_CFG1_MASK;
>> +	val[1] = (play_rate >> HAP_RATE_CFG2_SHIFT) & HAP_RATE_CFG2_MASK;
>
> Make val a u16 and FIELD_PREP() the bits in there, will be easier to
> reason about.
>
>> +	rc = qpnp_haptics_write(haptics, HAP_RATE_CFG1_REG(haptics), val, 2);
>> +	if (rc < 0)
>> +		return rc;
>> +
>> +	return 0;
>> +}
>> +
>> +/*
>> + * qpnp_haptics_set_auto_res() - Auto resonance
>> + * allows the haptics to automatically adjust the
>> + * speed of the oscillation in order to maintain
>> + * the resonant frequency.
>> + */
>> +static int qpnp_haptics_set_auto_res(struct qpnp_haptics *haptics, bool enable)
>> +{
>> +	int rc = 0;
>> +	u8 val;
>> +
>> +	// LRAs are the only type to support auto res
>> +	if (haptics->actuator_type != HAP_TYPE_LRA)
>> +		return 0;
>> +
>> +	val = enable ? AUTO_RES_EN_BIT : 0;
>> +
>> +	rc = qpnp_haptics_write_masked(haptics, HAP_TEST2_REG(haptics),
>> +			AUTO_RES_EN_BIT, val);
>
> return qpnp_haptics_write_masked();
>
>> +	if (rc < 0)
>> +		return rc;
>> +
>> +	dev_dbg(&haptics->pdev->dev, "Auto resonance enabled: %d", enable);
>> +	return rc;
>> +}
>> +
>> +static int qpnp_haptics_write_brake(struct qpnp_haptics *haptics)
>> +{
>> +	int ret, i;
>> +	u32 temp;
>> +	u8 val;
>> +
>> +	dev_dbg(&haptics->pdev->dev, "Configuring brake pattern");
>> +
>> +	ret = qpnp_haptics_write_masked(haptics, HAP_EN_CTL2_REG(haptics),
>> +			BRAKE_EN_BIT, 1);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	for (i = HAP_BRAKE_PAT_LEN - 1, val = 0; i >= 0; i--) {
>> +		u8 p = haptics->brake_pat[i] & HAP_BRAKE_PAT_MASK;
>> +
>> +		temp = i << 1;
>> +		val |= p << temp;
>
> 		val |= p << (i * 2);
>
> Would make this trivial to understand. The temp variable and the extra
> bitshifting is confusing, and the compiler will help you with the
> optimization.
>
>> +	}
>> +
>> +	ret = qpnp_haptics_write(haptics, HAP_BRAKE_REG(haptics), &val, 1);
>
> return qpnp_haptics_write();
>
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	return 0;
>> +}
>> +
>> +static int qpnp_haptics_write_buffer_config(struct qpnp_haptics *haptics)
>> +{
>> +	u8 buf[HAP_WAVE_SAMP_LEN];
>> +	int rc, i;
>> +
>> +	dev_dbg(&haptics->pdev->dev, "Writing buffer config");
>> +
>> +	for (i = 0; i < HAP_WAVE_SAMP_LEN; i++)
>> +		buf[i] = haptics->wave_samp[i];
>> +
>> +	rc = qpnp_haptics_write(haptics, HAP_WF_S1_REG(haptics), buf,
>> +			HAP_WAVE_SAMP_LEN);
>
> return qpnp_haptics_write();
>
>> +
>> +	return rc;
>> +}
>> +
>> +/**
>> + * qpnp_haptics_write_wave_repeat() - write wave repeat values.
>
> This kernel-doc is incomplete. Either define it fully or drop one of the
> '*'
>
>> + */
>> +static int qpnp_haptics_write_wave_repeat(struct qpnp_haptics *haptics)
>> +{
>> +	int ret;
>> +	u8 val = 0, mask = 0;
>
> No need to zero-initialize these.
>
>> +
>> +	// The number of times to repeat each wave
>
> /* Comments */
>
>> +	mask = WF_REPEAT_MASK;
>> +	val = ilog2(1) << WF_REPEAT_SHIFT; // Currently hard coded to default of 1
>
> So how about val = 0; ?
>
> If you want to leave some of this code around as a todo, perhaps write
> it as:
>
> 	mask = WF_REPEAT_MASK | WF_S_REPEAT_MASK;
> 	val = FIELD_PREP(WF_REPEAT_MASK, 0) |
> 	      FIELD_PREP(WF_S_REPEAT_MASK, 0);
>
> 	return qpnp_haptics_write_masked();
>
>> +
>> +	// the number of times to repeat each wave sample (group of waves)
>> +	mask |= WF_S_REPEAT_MASK;
>> +	val |= ilog2(1);
>> +
>> +	ret = qpnp_haptics_write_masked(haptics, HAP_WF_REPEAT_REG(haptics),
>> +			mask, val);
>> +	return ret;
>> +}
>> +
>> +static int qpnp_haptics_write_play_control(struct qpnp_haptics *haptics,
>> +						enum hap_play_control ctrl)
>> +{
>> +	u8 val;
>> +	int rc;
>> +
>> +	switch (ctrl) {
>> +	case HAP_STOP:
>> +		val = 0;
>> +		break;
>> +	case HAP_PAUSE:
>> +		val = HAP_PAUSE_BIT;
>> +		break;
>> +	case HAP_PLAY:
>> +		val = HAP_PLAY_BIT;
>> +		break;
>> +	default:
>> +		return 0;
>> +	}
>> +
>> +	rc = qpnp_haptics_write(haptics, HAP_PLAY_REG(haptics), &val, 1);
>> +	if (rc < 0) {
>> +		pr_err("Error writing to PLAY_REG, rc=%d\n", rc);
>
> You already printed in all possible code paths through
> qpnp_haptics_write()
>
>
> Move the dev_dbg below up above the write and you can simply:
>
> 	return qpnp_haptics_write();
>
>> +		return rc;
>> +	}
>> +
>> +	dev_dbg(&haptics->pdev->dev, "haptics play ctrl: %d\n", ctrl);
>> +	return rc;
>> +}
>> +
>> +/*
>> + * This IRQ is fired to tell us to load the next wave sample set.
>> + * As we only currently support a single sample set, it's unused.
>> + */
>> +static irqreturn_t qpnp_haptics_play_irq_handler(int irq, void *data)
>> +{
>> +	struct qpnp_haptics *haptics = data;
>> +
>> +	dev_dbg(&haptics->pdev->dev, "play_irq triggered");
>> +
>> +	return IRQ_HANDLED;
>> +}
>> +
>> +/*
>> + * Fires every ~50ms whilst the haptics are active.
>> + * If the SC_FLAG_BIT is set then that means there isn't a short circuit
>> + * and we just need to clear the IRQ to indicate that the device should
>> + * keep vibrating.
>> + *
>> + * Otherwise, it means a short circuit situation has occurred.
>> + */
>> +static irqreturn_t qpnp_haptics_sc_irq_handler(int irq, void *data)
>> +{
>> +	struct qpnp_haptics *haptics = data;
>> +	int ret;
>> +	u8 val;
>> +	s64 sc_delta_time_us;
>> +	ktime_t temp;
>> +
>> +	ret = qpnp_haptics_read(haptics, HAP_STATUS_1_REG(haptics), &val, 1);
>> +	if (ret < 0)
>> +		return IRQ_HANDLED;
>> +
>> +	if (!(val & SC_FLAG_BIT)) {
>> +		haptics->sc_count = 0;
>> +		return IRQ_HANDLED;
>> +	}
>> +
>> +	temp = ktime_get();
>> +	sc_delta_time_us = ktime_us_delta(temp, haptics->last_sc_time);
>> +	haptics->last_sc_time = temp;
>> +
>> +	if (sc_delta_time_us > SC_COUNT_RST_DELAY_US)
>> +		haptics->sc_count = 0;
>> +	else
>> +		haptics->sc_count++;
>> +
>> +	// Clear the interrupt flag
>> +	val = SC_CLR_BIT;
>> +	ret = qpnp_haptics_write(haptics, HAP_SC_CLR_REG(haptics), &val, 1);
>> +	if (ret < 0) {
>> +		pr_err("Error writing to SC_CLR_REG, rc=%d\n", ret);
>
> You already printed in qpnp_haptics_write()
>
>> +		return IRQ_HANDLED;
>> +	}
>> +
>> +	if (haptics->sc_count > SC_MAX_COUNT) {
>> +		pr_crit("Short circuit persists, disabling haptics\n");
>
> dev_crit()?
>
>> +		ret = qpnp_haptics_module_enable(haptics, false);
>> +		if (ret < 0) {
>> +			pr_err("Error disabling module, rc=%d\n", ret);
>
> dev_err(), and qpnp_haptics_module_enable() already printed an error.
>
> That said, these error messages are more useful, so perhaps it's worth
> deciding to move it out to the callers?
>
>> +			return IRQ_HANDLED;
>
> You can just fall down do the return below...
>
>> +		}
>> +	}
>> +
>> +	return IRQ_HANDLED;
>> +}
>> +
>> +
>> +/**
>> + * qpnp_haptics_init() - Initialise haptics hardware for use
>> + * @haptics: haptics device
>
> Missing "Returns:"
>
>> + */
>> +static int qpnp_haptics_init(struct qpnp_haptics *haptics)
>> +{
>> +	int ret;
>> +	u8 val, mask;
>> +	u16 auto_res_mode;
>> +	u16 play_rate = 0;
>
> First use is an assignment, no need to zero-initialize.
>
>> +
>> +	ret = qpnp_haptics_write_masked(haptics, HAP_CFG1_REG(haptics),
>> +		HAP_ACT_TYPE_MASK, haptics->actuator_type);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	// Configure auto resonance
>
> /*
>  * Multi-line comment.
>  */
>
>> +	// see qpnp_haptics_lra_auto_res_config downstream
>> +	// This is greatly simplified.
>> +	auto_res_mode = HAP_AUTO_RES_ZXD_EOP << LRA_AUTO_RES_MODE_SHIFT;
>> +
>> +	//Default LRA calibration period
>> +	val = ilog2(32 / HAP_RES_CAL_PERIOD_MIN);
>> +
>> +	val |= (auto_res_mode << LRA_AUTO_RES_MODE_SHIFT);
>
> You shift HAP_AUTO_RES_ZXD_EOP twice here.
>
>> +	// The 1 here is for OPT2 "High Z configuration", there are 3
>> +	// options and no documentation indicating the difference
>> +	val |= (1 << LRA_HIGH_Z_SHIFT);
>
> Consider writing this as:
>
> 	val = FIELD_PREP(LRA_RES_CAL_MASK, ilog2(32 / HAP_RES_CAL_PERIOD_MIN) |
> 	      FIELD_PREP(LRA_AUTO_RES_MODE_MASK, HAP_AUTO_RES_ZXD_EOP) |
> 	      FIELD_PREP(LRA_HIGH_Z_MASK, 1);
>
>> +	mask = LRA_AUTO_RES_MODE_MASK | LRA_HIGH_Z_MASK | LRA_RES_CAL_MASK;
>> +
>> +	ret = qpnp_haptics_write_masked(haptics, HAP_LRA_AUTO_RES_REG(haptics),
>> +			mask, val);
>> +
>> +	dev_dbg(&haptics->pdev->dev, "%s: auto_res_mode: %d\n", __func__,
>> +		auto_res_mode);
>> +
>> +	/* Configure the PLAY MODE register */
>> +	ret = qpnp_haptics_write_play_mode(haptics);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	ret = qpnp_haptics_write_vmax(haptics);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	/* Configure the ILIM register */
>> +	ret = qpnp_haptics_write_current_limit(haptics);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	// Configure the debounce for short-circuit detection.
>> +	val = HAP_SC_DEB_CYCLES_MAX;
>
> This val is unused.
>
>> +	ret = qpnp_haptics_write_masked(haptics, HAP_SC_DEB_REG(haptics),
>> +			HAP_SC_DEB_MASK, HAP_SC_DEB_CYCLES_MAX);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	// write the wave shape
>> +	ret = qpnp_haptics_write_masked(haptics, HAP_CFG2_REG(haptics),
>> +			HAP_LRA_RES_TYPE_MASK, haptics->wave_shape);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	play_rate = haptics->play_wave_rate / HAP_RATE_CFG_STEP_US;
>> +
>> +	/*
>> +	 * Configure RATE_CFG1 and RATE_CFG2 registers.
>> +	 * Note: For ERM these registers act as play rate and
>> +	 * for LRA these represent resonance period
>> +	 */
>> +	ret = qpnp_haptics_write_play_rate(haptics, play_rate);
>
> You don't check this ret.
>
>> +
>> +	ret = qpnp_haptics_write_brake(haptics);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	if (haptics->play_mode == HAP_PLAY_BUFFER) {
>> +		ret = qpnp_haptics_write_wave_repeat(haptics);
>> +		if (ret < 0)
>> +			return ret;
>> +
>> +		ret = qpnp_haptics_write_buffer_config(haptics);
>> +	}
>> +
>> +	if (haptics->play_irq >= 0) {
>
> Afaict, you won't leave probe successfully with this < 0.
>
>> +		dev_dbg(&haptics->pdev->dev, "%s: Requesting play IRQ, irq: %d", __func__,
>> +			haptics->play_irq);
>> +		ret = devm_request_threaded_irq(&haptics->pdev->dev, haptics->play_irq,
>> +			NULL, qpnp_haptics_play_irq_handler, IRQF_ONESHOT,
>> +			"haptics_play_irq", haptics);
>> +
>> +		if (ret < 0) {
>> +			pr_err("Unable to request play IRQ ret=%d\n", ret);
>> +			return ret;
>> +		}
>> +
>> +		/* use play_irq only for buffer mode */
>> +		if (haptics->play_mode != HAP_PLAY_BUFFER)
>> +			disable_irq(haptics->play_irq);
>> +	}
>> +
>> +	if (haptics->sc_irq >= 0) {
>
> Same here.
>
>> +		dev_dbg(&haptics->pdev->dev, "%s: Requesting play IRQ, irq: %d", __func__,
>> +			haptics->play_irq);
>> +		ret = devm_request_threaded_irq(&haptics->pdev->dev, haptics->sc_irq,
>> +			NULL, qpnp_haptics_sc_irq_handler, IRQF_ONESHOT,
>> +			"haptics_sc_irq", haptics);
>> +
>> +		if (ret < 0) {
>> +			pr_err("Unable to request sc IRQ ret=%d\n", ret);
>> +			return ret;
>> +		}
>> +	}
>> +
>> +	return ret;
>
> ret is 0 when you get here.
>
>> +}
>> +
>> +/**
>> + * qpnp_haptics_set - handler to start/stop vibration
>> + * @haptics: pointer to haptics struct
>> + * @enable: state to set
>
>   * Returns:
>
>> + */
>> +static int qpnp_haptics_set(struct qpnp_haptics *haptics, bool enable)
>
> Consider splitting this into haptics_enable() and haptics_disable(), as
> this really just is two separate functions squashed into one.
>
>> +{
>> +	int ret;
>> +
>> +	mutex_lock(&haptics->play_lock);
>> +
>> +	if (enable) {
>> +		if (haptics->sc_count > SC_MAX_COUNT) {
>> +			pr_err("Can't play while in short circuit");
>> +			ret = -1;
>> +			goto out;
>> +		}
>> +		ret = qpnp_haptics_set_auto_res(haptics, false);
>> +		if (ret < 0) {
>> +			pr_err("Error disabling auto_res, ret=%d\n", ret);
>> +			goto out;
>> +		}
>> +
>> +		ret = qpnp_haptics_module_enable(haptics, true);
>> +		if (ret < 0) {
>> +			pr_err("Error enabling module, ret=%d\n", ret);
>> +			goto out;
>> +		}
>> +
>> +		ret = qpnp_haptics_write_play_control(haptics, HAP_PLAY);
>> +		if (ret < 0) {
>> +			pr_err("Error enabling play, ret=%d\n", ret);
>> +			goto out;
>> +		}
>> +
>> +		ret = qpnp_haptics_set_auto_res(haptics, true);
>> +		if (ret < 0) {
>> +			pr_err("Error enabling auto_res, ret=%d\n", ret);
>> +			goto out;
>> +		}
>> +	} else {
>> +		ret = qpnp_haptics_write_play_control(haptics, HAP_STOP);
>> +		if (ret < 0) {
>> +			pr_err("Error disabling play, ret=%d\n", ret);
>> +			goto out;
>> +		}
>> +
>> +		ret = qpnp_haptics_module_enable(haptics, false);
>> +		if (ret < 0) {
>> +			pr_err("Error disabling module, ret=%d\n", ret);
>> +			goto out;
>> +		}
>> +	}
>> +
>> +out:
>> +	mutex_unlock(&haptics->play_lock);
>> +	return ret;
>> +}
>> +
>> +/*
>> + * Threaded function to update the haptics state.
>> + */
>> +static void qpnp_haptics_work(struct work_struct *work)
>> +{
>> +	struct qpnp_haptics *haptics = container_of(work, struct qpnp_haptics, work);
>> +
>> +	int ret;
>> +	bool enable;
>> +
>> +	enable = atomic_read(&haptics->active);
>> +	dev_dbg(&haptics->pdev->dev, "%s: state: %d\n", __func__, enable);
>> +
>> +	ret = qpnp_haptics_set(haptics, enable);
>> +	if (ret < 0)
>> +		pr_err("Error setting haptics, ret=%d", ret);
>> +}
>> +
>> +/**
>> + * qpnp_haptics_close - callback for input device close
>> + * @dev: input device pointer
>> + *
>> + * Turns off the vibrator.
>> + */
>> +static void qpnp_haptics_close(struct input_dev *dev)
>> +{
>> +	struct qpnp_haptics *haptics = input_get_drvdata(dev);
>> +
>> +	cancel_work_sync(&haptics->work);
>> +	if (atomic_read(&haptics->active)) {
>> +		atomic_set(&haptics->active, 0);
>> +		schedule_work(&haptics->work);
>> +	}
>> +}
>> +
>> +/**
>> + * qpnp_haptics_play_effect - play haptics effects
>> + * @dev: input device pointer
>> + * @data: data of effect
>> + * @effect: effect to play
>> + */
>> +static int qpnp_haptics_play_effect(struct input_dev *dev, void *data,
>> +					struct ff_effect *effect)
>> +{
>> +	struct qpnp_haptics *haptics = input_get_drvdata(dev);
>> +
>> +	dev_dbg(&haptics->pdev->dev, "%s: Rumbling with strong: %d and weak: %d", __func__,
>> +		effect->u.rumble.strong_magnitude, effect->u.rumble.weak_magnitude);
>> +
>> +	haptics->magnitude = effect->u.rumble.strong_magnitude >> 8;
>> +	if (!haptics->magnitude)
>> +		haptics->magnitude = effect->u.rumble.weak_magnitude >> 10;
>> +
>> +	if (!haptics->magnitude) {
>> +		atomic_set(&haptics->active, 0);
>> +		goto end;
>> +	}
>> +
>> +	atomic_set(&haptics->active, 1);
>> +
>> +	haptics->vmax = ((HAP_VMAX_MAX_MV - HAP_VMAX_MIN_MV) * haptics->magnitude) / 100 +
>> +					HAP_VMAX_MIN_MV;
>> +
>> +	dev_dbg(&haptics->pdev->dev, "%s: magnitude: %d, vmax: %d", __func__,
>> +		haptics->magnitude, haptics->vmax);
>> +
>> +	qpnp_haptics_write_vmax(haptics);
>> +
>> +end:
>> +	schedule_work(&haptics->work);
>> +
>> +	return 0;
>> +}
>> +
>> +static int qpnp_haptics_probe(struct platform_device *pdev)
>> +{
>> +	struct qpnp_haptics *haptics;
>> +	struct device_node *node;
>> +	struct input_dev *input_dev;
>> +	int ret;
>> +	u32 val;
>> +	int i;
>> +
>> +	haptics = devm_kzalloc(&pdev->dev, sizeof(*haptics), GFP_KERNEL);
>> +	if (!haptics)
>> +		return -ENOMEM;
>> +
>> +	haptics->regmap = dev_get_regmap(pdev->dev.parent, NULL);
>> +	if (!haptics->regmap)
>> +		return -ENODEV;
>> +
>> +	node = pdev->dev.of_node;
>> +
>> +	haptics->pdev = pdev;
>> +
>> +	ret = of_property_read_u32(node, "reg", &haptics->base);
>> +	if (ret < 0) {
>> +		pr_err("Couldn't find reg in node = %s ret = %d\n",
>
> dev_err()
>
>> +			node->full_name, ret);
>> +		return ret;
>> +	}
>> +
>> +	if (haptics->base <= 0) {
>> +		pr_err("Invalid base address: 0x%x\n", haptics->base);
>
> dev_err() but how could it be <= 0 if the read returned ok?
>
>> +		return -EINVAL;
>> +	}
>> +
>> +	haptics->play_irq = platform_get_irq_byname(pdev, "play");
>> +	if (haptics->play_irq < 0) {
>> +		dev_err(&pdev->dev, "Unable to get play irq\n");
>> +		ret = haptics->play_irq;
>> +		goto register_fail;
>> +	}
>> +
>> +	haptics->sc_irq = platform_get_irq_byname(pdev, "short");
>> +	if (haptics->sc_irq < 0) {
>> +		dev_err(&pdev->dev, "Unable to get sc irq\n");
>> +		ret = haptics->sc_irq;
>> +		goto register_fail;
>> +	}
>> +
>> +	// We only support LRAs for now
>> +	haptics->actuator_type = HAP_TYPE_LRA;
>> +	ret = of_property_read_u32(node, "qcom,actuator-type", &val);
>> +	if (!ret) {
>> +		if (val != HAP_TYPE_LRA) {
>> +			dev_err(&pdev->dev, "qcom,actuator-type (%d) isn't supported\n", val);
>> +			ret = -EINVAL;
>> +			goto register_fail;
>> +		}
>> +		haptics->actuator_type = val;
>> +	}
>> +
>> +	// Only buffer mode is currently supported
>> +	haptics->play_mode = HAP_PLAY_BUFFER;
>> +	ret = of_property_read_u32(node, "qcom,play-mode", &val);
>> +	if (!ret) {
>> +		if (val != HAP_PLAY_BUFFER) {
>> +			dev_err(&pdev->dev, "qcom,play-mode (%d) isn't supported\n", val);
>> +			ret = -EINVAL;
>> +			goto register_fail;
>> +		}
>> +		haptics->play_mode = val;
>> +	}
>> +
>> +	ret = of_property_read_u32(node,
>> +			"qcom,wave-play-rate-us", &val);
>
> Unwrap this line.
>
>> +	if (!ret) {
>> +		haptics->play_wave_rate = val;
>> +	} else if (ret != -EINVAL) {
>> +		pr_err("Unable to read play rate ret=%d\n", ret);
>> +		goto register_fail;
>> +	}
>> +
>> +	haptics->wave_shape = HAP_WAVE_SINE;
>> +	ret = of_property_read_u32(node, "qcom,wave-shape", &val);
>> +	if (!ret) {
>> +		if (val != HAP_WAVE_SINE && val != HAP_WAVE_SQUARE) {
>> +			dev_err(&pdev->dev, "qcom,wave-shape is invalid: %d\n", val);
>> +			ret = -EINVAL;
>> +			goto register_fail;
>> +		}
>> +		haptics->wave_shape = val;
>> +	}
>> +
>> +	ret = of_property_read_u8_array(node, "qcom,brake-pattern", haptics->brake_pat, 4);
>> +	// Default if not set
>> +	if (ret == -EINVAL) {
>> +		haptics->brake_pat[0] = 0x3;
>> +		haptics->brake_pat[1] = 0x3;
>> +		haptics->brake_pat[2] = 0x2;
>> +		haptics->brake_pat[3] = 0x1;
>
> You could rely on the fact that these operations doesn't touch the
> buffer if the read is going to fail and do:
>
> 	haptics->brake_pat[0] = 0x3;
> 	...
> 	ret = of_property_read_u8_array();
> 	if (ret < 0 && ret != -EINVAL)
> 		fail;
>
> As that will either have the default values (-EINVAL) or the newly
> populated values (0).
>
>> +	} else if (ret) {
>> +		dev_err(&pdev->dev, "qcom,brake-pattern is invalid, ret = %d\n", ret);
>
> So a qcom,brake-pattern was defined in DT, but it's format is invalid
> for some reason. I think it would be better to help the developer find
> this by failing the probe here. Otherwise they will have to rely on
> someone detecting that line in the kernel log, or some tester noticing
> that the behavior is slightly off.
>
>> +	}
>> +
>> +	haptics->current_limit = HAP_ILIM_400_MA;
>> +
>> +	for (i = 0; i < HAP_WAVE_SAMP_LEN; i++)
>> +		haptics->wave_samp[i] = HAP_WF_SAMP_MAX;
>> +
>> +	haptics->play_wave_rate =
>
> Perhaps move this up to the place where you assigned play_wave_rate?
>
>> +		clamp_t(u32, haptics->play_wave_rate,
>> +		HAP_WAVE_PLAY_RATE_MIN_US, HAP_WAVE_PLAY_RATE_MAX_US);
>> +
>> +	ret = qpnp_haptics_init(haptics);
>> +	if (ret < 0) {
>> +		dev_err(&pdev->dev, "Error initialising haptics, ret=%d\n",
>> +			ret);
>> +		goto register_fail;
>> +	}
>> +
>> +	platform_set_drvdata(pdev, haptics);
>> +
>> +	input_dev = devm_input_allocate_device(&pdev->dev);
>> +	if (!input_dev)
>> +		return -ENOMEM;
>> +
>> +	INIT_WORK(&haptics->work, qpnp_haptics_work);
>> +	haptics->haptics_input_dev = input_dev;
>> +
>> +	input_dev->name = "qpnp_haptics";
>> +	input_dev->id.version = 3;
>> +	input_dev->close = qpnp_haptics_close;
>> +	input_set_drvdata(input_dev, haptics);
>> +	// Figure out how to make this FF_PERIODIC
>> +	input_set_capability(haptics->haptics_input_dev, EV_FF, FF_RUMBLE);
>> +
>> +	ret = input_ff_create_memless(input_dev, NULL,
>> +					qpnp_haptics_play_effect);
>> +	if (ret) {
>> +		dev_err(&pdev->dev,
>> +			"couldn't register vibrator as FF device\n");
>> +		goto register_fail;
>> +	}
>> +
>> +	ret = input_register_device(input_dev);
>> +	if (ret) {
>> +		dev_err(&pdev->dev, "couldn't register input device\n");
>> +		goto register_fail;
>> +	}
>> +
>> +	return 0;
>> +
>> +register_fail:
>> +	cancel_work_sync(&haptics->work);
>> +	mutex_destroy(&haptics->play_lock);
>> +
>> +	return ret;
>> +}
>> +
>> +static int __maybe_unused qpnp_haptics_suspend(struct device *dev)
>> +{
>> +	struct qpnp_haptics *haptics = dev_get_drvdata(dev);
>> +
>> +	cancel_work_sync(&haptics->work);
>> +	qpnp_haptics_set(haptics, false);
>> +
>> +	return 0;
>> +}
>> +
>> +static SIMPLE_DEV_PM_OPS(qpnp_haptics_pm_ops, qpnp_haptics_suspend, NULL);
>> +
>> +static int qpnp_haptics_remove(struct platform_device *pdev)
>> +{
>> +	struct qpnp_haptics *haptics = dev_get_drvdata(&pdev->dev);
>> +
>
> Don't you need a input_unregister_device() here?
>
>> +	cancel_work_sync(&haptics->work);
>> +	mutex_destroy(&haptics->play_lock);
>> +	dev_set_drvdata(&pdev->dev, NULL);
>
> I don't see a reason for you to clear the drvdata here.
>
>> +
>> +	return 0;
>> +}
>> +
>> +static void qpnp_haptics_shutdown(struct platform_device *pdev)
>> +{
>> +	struct qpnp_haptics *haptics = dev_get_drvdata(&pdev->dev);
>> +
>> +	cancel_work_sync(&haptics->work);
>> +
>> +	qpnp_haptics_set(haptics, false);
>> +}
>> +
>> +static const struct of_device_id qpnp_haptics_match_table[] = {
>> +	{ .compatible = "qcom,qpnp-haptics" },
>
> "qcom,spmi-haptics"
>
>> +	{ }
>> +};
>> +MODULE_DEVICE_TABLE(of, qpnp_haptics_match_table);
>> +
>> +static struct platform_driver qpnp_haptics_driver = {
>> +	.probe		= qpnp_haptics_probe,
>> +	.remove		= qpnp_haptics_remove,
>> +	.shutdown	= qpnp_haptics_shutdown,
>> +	.driver		= {
>> +		.name	= "qpnp-haptics",
>> +		.pm	= &qpnp_haptics_pm_ops,
>> +		.of_match_table = qpnp_haptics_match_table,
>> +	},
>> +};
>> +module_platform_driver(qpnp_haptics_driver);
>> +
>> +MODULE_ALIAS("platform:qpnp_haptics");
>
> Nothing is going to trigger autoloading of a platform driver with the
> alias "qpnp_haptics". Please skip this.
>
> Regards,
> Bjorn
>
>> +MODULE_DESCRIPTION("QPNP haptics driver using ff-memless framework");
>> +MODULE_LICENSE("GPL v2");
>> +MODULE_AUTHOR("Caleb Connolly <caleb@xxxxxxxxxxxxx>");
>> --
>> 2.31.1
>>
>>

--
Kind Regards,
Caleb